This targeted existing cars like the aging Ford GT40 Mk.I and the newer Lola T70 coupe. Well aware that few manufacturers were ready to take up the challenge immediately, the CSI also allowed the participation of five-litre Group 4 sports cars, of which a minimum of 50 units had to be manufactured. This capacity reduction would also serve to entice manufacturers who were already building three-litre Formula One engines to adapt them for endurance racing. In an effort to reduce the speeds at Le Mans and other fast circuits of the unlimited capacity Group 6 prototypes (such as the seven-litre Ford GT40 Mk.IV and four-litre V12 Ferrari P) the Commission Sportive Internationale (then the independent competition arm of the FIA) announced that the International Championship of Makes would be run for three-litre Group 6 prototypes for four years from 1968 through 1971. For the 40th anniversary of the 917 in 2009 Porsche held a special celebration at the Goodwood Festival of Speed (3–5 July). In 2017 the car driven by McQueen in the film was sold at auction for $14m, a record price for a Porsche. In 1971 the car featured in the Steve McQueen film Le Mans. The long tail Langheck version had a maximum measured top speed of 362 km/h (225 mph). Powered by the Type 912 flat-12 engine of 4.5, 4.9, or 5 liters, the 917/30 Can-Am variant was capable of 0-62 mph (100 km/h) time of 2.3 seconds and 0–124 mph (200 km/h) in 5.3 seconds. The 917 gave Porsche its first overall wins at the 24 Hours of Le Mans in 19. The Porsche 917 is a sports prototype race car developed by German manufacturer Porsche. ( August 2021) ( Learn how and when to remove this template message)

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